Adjustable scaffold



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Pate nted July 3, 1894.

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i UNITED STATE-s PATENT OFFIC J MoN oEKING, on PRINCETON, INDIANA.

D USTAlBLE; soAFFo 1.0.

SPECIFICATION forming partof "Letters Patent l lo. 522,526, dated July3,1894. 7

Application filed-Tune 17 11892 Renewed ll'une 7, 1894; s ialN 513,833.(No model.)

To all whom itmay concern: 7

Be it known that I, MONRoE'KING,a citizen of the UnitedStates, residingat Princeton, in the county of Gibson and State of Indiana, haveinvented certain new and usefullmprovements in Adjustable Scafiolds, ofwhich thefollowingisaspecification,referencebeing had therein to theaccompanying drawings.

This invention relates to a new and improved extensible scafiold; and ithas for its object to provide a scafiold of simple construction, whichmay be readily raised or lowered, and extended in length when desired.

In the drawings: Figure 1 is a perspective View of my improved scaffold.Fig. 2 is a transverse vertical sectional view. Fig. 3 is a detailsectional view ofa portion of the extensible operating shaft; and Fig. tis a detail of an extensible side bar.

Referring to thedrawings a--a designate the end frames of myscaffold'which are composed of the posts a'a', connected by thecross-bars a"a". These cross-bars are socured to both sides of saidposts, and form guides for the vertically movable frames 13,1).

.These vertically movable frames are composed of the vertical postsb'-b, whose outer sides bear against the inner sides of the posts of thestationary frames, and the upper horizontal cross-piece b" which issecured to the upper ends of the postsb'bsnitablebraces being providedto hold the vertical posts rigid.

The upper ends of the posts a of the stationary frames are recessed asshown in Fig. 1, to receive the extended ends of the crossbars b -b" ofthe movable frames when said frames are lowered. The object of this isto protect the ends of the cross-bars of the movable frames-when movingthe folded scaffold. This construction also renders the end frames morerigid when the scafiold is folded. The stationary end frames areconnected and held in an upright positition by the side bars c-c, saidside-bars being removably secured to the end post of the stationaryframes for a purpose hereinafter described.

To the outer sides of the posts of the stationary frames, at a suitablepoint thereon, are secured cross-bars d'd, in the center of which isjournaled the extensible operating shaft e. This shaft extendslengthwise of the .scafiold and: is formed of two sections of equallength conneetedby a sleeve 6', the-two sections of the shaft beingadjustably held in ,said sleeve by means of two set-screws ff tappedthrough the sleeve, one set-screw bearing on each section of the shaft.On the shaft 6, and near the inner sides of the cross-bars d are rigidlysecured drums g, and to these drums are secured cords or chains h whoseother ends are removably secured to the under side of the lower ends ofthe posts of the movable frames.

The operating shaft is extended beyond the cross-bars d and have squaredends over which may be placed the end of a crank for revolving saidshaft.

When the operatingshaft is revolved, the

cords h .will be wound on the drums g-g and the movable frames raised asis evident.

To hold the movable frames in their raised position I provide pins iwhich are passed through holes in the posts of the stationary frames,and extend into corresponding holes or recesses in the adjacent sides ofthe posts of the movable frames. A series of these holes is provided inorder that the movable frame may be held in its various adjusted po-.

sitions. The pins II are secured to the posts a" by means of cords orchains t" in order that they will always be in position for use, andwill not become misplaced.

When it is desired to extend the scaffold in length the side-bars c areremoved, and bars of a greater length secured to the posts in theirstead; or an extensible bar'shown in Fig. 4: formed of two pieces,slotted at their overlapping ends and adj ustably secured together by abolt, may be used, and adjusted to correspond to the adjustment of theoperating shaft. It will thus be seen'that I provide a scaffold ofsimple construction which may be adjusted in length and height, andwhich may be securely locked in its adjusted positions. Anotheradvantage of myimprovement is that my scafiold may be readily takenapart, which facilitates the moving of the scafiold from room to roomwhen it is used in buildings for any of the various purposes requiringscaffoldin Asshown inFig. 2 of the drawings the posts of the stationaryframes may be provided at centrally in the stationary frames and meansfor revolving said shaft, cords or chains secured at one of their endsto said shaft, their other ends being secured to the lower ends of themovable frames, means forsecuring the movable frames in their raisedposition and extensible side-bars connecting the stationary frames,substantially as described.

- 2. An extensible scaffold consisting of a longitudinally adjustableframe, vertically movable frames supported by said stationary frame, anoperating shaft journaled in the stationary frame, said shaft consistingof two sections adjustably connected by a sleeve and set screws, cordssecured at one of their ends to the shaft at each end thereof, the otherends of said cords being secured to the lower ends of the posts of themovable frames, removable pins adapted to pass through one of a seriesof holes in the posts of the stationary frame, their inner ends enteringone of a series of holes formed in the posts of the movable frames, andmeans for revolving the operating shaft, substantiallyas described.

In testimony whereof I alfix my signature in presence of two witnesses,

MONROE KING. Witnesses:

GEORGE A. LAND, EDWARD E. SHARPE.

